Phosphor Stripe Laser Display for Compact Color Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display technologies, such as CRTs, face limitations due to the use of cathode-ray tubes, leading to a decline in demand, and existing laser-based displays often require complex optical lens systems or large sizes to produce color images effectively.
Innovation Solution
The use of a laser display system with a screen comprising multiple phosphor stripes that absorb laser light to emit colored light, combined with a laser module to project and modulate the laser beam, allowing for the production of color images without direct light emission from the laser itself, and incorporating optical sensors and feedback mechanisms for alignment and image control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional projection displays use optical lens systems to project color images, then image quality is improved, but device complexity and size increase
Solution Approach 1:
The display screen is segmented into multiple phosphor stripes (red, green, blue) that can be independently excited by the laser beam. Each phosphor stripe converts the laser light to its specific color, eliminating the need for complex optical lens systems while maintaining color image quality.
Solution Approach 2:
The patent replaces the mechanical optical lens system with a phosphor-based light conversion system. Instead of using lenses to project and focus light, the system uses phosphor materials that directly convert laser light to visible colors at the screen location, simplifying the optical path.
2Volume of moving object
If direct display systems use three light sources in red, green and blue to produce color images, then device size is reduced, but manufacturing complexity increases
Solution Approach 1:
A single laser source performs multiple functions by sequentially exciting different phosphor stripes. The same laser beam is used to excite red, green, and blue phosphors in sequence, eliminating the need for three separate light sources while maintaining compact device size.
Solution Approach 2:
The laser beam is modulated to periodically excite different phosphor stripes in sequence (red, green, blue). This time-division multiplexing approach allows a single laser source to produce all three primary colors by rapidly switching between phosphor excitations, simplifying manufacturing while maintaining small device size.
3Illumination intensity
If CRT displays use scanning electron beams to excite color phosphors, then color vividness and brightness are improved, but technical limitations and maintenance difficulty increase
Solution Approach 1:
The patent replaces the electron beam excitation mechanism with optical laser excitation. Instead of using cathode-ray tubes and electron beams, the system uses solid-state laser diodes to excite the phosphor materials, eliminating the technical limitations and reliability issues associated with CRT technology while maintaining bright and vivid color output.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables the creation of compact, efficient, and high-resolution color displays that can produce true black pixels, improving contrast ratio and reducing the need for complex optical systems, thus overcoming the limitations of traditional technologies.
Implementation Method 1
a first phosphor to absorb light at an excitation wavelength to emit light of a first color, a second phosphor to absorb light at the excitation wavelength to emit light of a second color, and a third phosphor to absorb light at the excitation wavelength to emit light of a third color
Data Source
AI summary
Laser display systems using at least one scanning laser beam to excite one or more fluorescent materials on a screen which emit light to form images. The fluorescent materials may include phosphor materials.